Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing a first image in a firstsequence according to a first embodiment of the claimed design;

FIG. 2 is a front view showing a second image in the first sequenceaccording to the first embodiment of the claimed design;

FIG. 3 is a front view showing a third image in the first sequenceaccording to the first embodiment of the claimed design;

FIG. 4 is a front view of a first image in a second sequence accordingto a second embodiment of the claimed design;

FIG. 5 is a front view of a second image in the second sequenceaccording to the second embodiment of the claimed design;

FIG. 6 is a front view of a third image in the second sequence accordingto the second embodiment of the claimed design;

FIG. 7 is a front view of a first image in a third sequence according toa third embodiment of the claimed design;

FIG. 8 is a front view of a second image in the third sequence accordingto the third embodiment of the claimed design; and,

FIG. 9 is a front view of a third image in the third sequence accordingto the third embodiment of the claimed design.

The appearance of the image transitions sequentially between the imagesshown in FIGS. 1-3; FIGS. 4-6; and FIGS. 7-9. The process or period inwhich one image transitions to another image forms no part of theclaimed design.

The shading depicts a contrast in appearance.

The outermost long-dash broken lines illustrate an electronic device,which is the environment of the design, and form no part of the claim.The remaining broken lines illustrate portions of the display screen andportions of the graphical user interface that form no part of theclaimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.